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For walls designated as Non-wood/Proprietary, there are two methods of specifying the walls properties with respect to deflection based on whether the wall is to be designed for capacity. Those which are designed for capacity are typically proprietary shear resisting elements, and those which are not designed for capacity are typically non-wood walls such as concrete, masonry, or steel walls.
To be Designed for Capacity
For these walls, you input the deflection of the wall at capacity as listed in the product literature for the element. The deflection of the element is the deflection at capacity multiplied by the ratio of the design force on the wall and the capacity.
Not to be Designed for Capacity
For these walls you input the wall's unit rigidity in lb/in/ft or N/mm/m.The value is multiplied by the length of the wall to get the stiffness, and the deflection of the element is determined by the force on the wall divided by the stiffness.